CN218771472U - Magnetic pole structure of high-power motor - Google Patents
Magnetic pole structure of high-power motor Download PDFInfo
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- CN218771472U CN218771472U CN202223234414.XU CN202223234414U CN218771472U CN 218771472 U CN218771472 U CN 218771472U CN 202223234414 U CN202223234414 U CN 202223234414U CN 218771472 U CN218771472 U CN 218771472U
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Abstract
The utility model relates to a magnetic pole structure of a high-power motor, which belongs to the field of motor rotor structures and comprises a rotating shaft and a rotor core arranged around the rotating shaft, wherein the outer ring of the rotor core is uniformly provided with a plurality of magnetic poles, and the rotor core is connected with the rotating shaft through a plurality of supporting ribs arranged at intervals; a ventilation groove is arranged between the magnetic poles and comprises groove edges which are symmetrically arranged and groove bottom corners with circular arcs, and the positions of the groove bottom corners are close to the rotating shaft; the rotor core comprises a plurality of lamination sheets, a plurality of groups of permanent magnets are arranged on the outer side of each lamination sheet, the permanent magnets are uniformly distributed on the magnetic poles, each group of permanent magnets comprises two permanent magnets which are symmetrically arranged, and an included angle between the two permanent magnets is 110 degrees. The utility model discloses the effectual torque that has reduced the motor is undulant, improves the heat dispersion of motor, strengthens the intensity unshakable in one's determination, guarantees the motor reliable operation.
Description
Technical Field
The utility model relates to a high power motor's magnetic pole structure belongs to electric motor rotor structure field.
Background
The permanent magnet synchronous motor has high efficiency, high output torque, high power density and good dynamic performance, but the permanent magnet synchronous motor has some defects, such as large torque fluctuation. Compared with a surface-mounted permanent magnet motor, the permanent magnet of the built-in permanent magnet motor is buried in the rotor core, so that the built-in permanent magnet motor is not easy to demagnetize compared with the surface-mounted permanent magnet motor. Meanwhile, the d-axis inductance of the built-in permanent magnet motor is larger than that of the surface-mounted permanent magnet motor, and is smaller than that of the q-axis inductance, so that the built-in permanent magnet motor has reluctance torque, and the electromotive force of the permanent magnet synchronous motor is required to be sine wave in order to generate constant electromagnetic torque. Therefore, how to reduce torque ripple of the interior permanent magnet synchronous motor becomes a hot spot of current research, and in terms of design of a motor body, a chute is generally adopted for an interior rotor structure, so that the chute makes manufacturing complicated and increases cost, and meanwhile, the output electromagnetic torque is possibly reduced. However, as the power of the motor increases, the thermal load of the motor is still high, and when the temperature of the motor rises too high, the permanent magnet also has the risk of demagnetization. Meanwhile, the volume of the iron core needs to be larger, which means that the area of the punching sheet is larger, the quantity is more, and the strength of the iron core also has problems.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned weak point, provide one kind, it is undulant in the torque that changes the rotor structure in order to reduce the motor to concentrate on, strengthen radiating effect and strengthen unshakable in one's determination's intensity, guarantee the motor reliable operation.
According to the technical scheme provided by the utility model, the magnetic pole structure of the high-power motor comprises a rotating shaft and a rotor core arranged around the rotating shaft, wherein a plurality of magnetic poles are uniformly arranged on the outer ring of the rotor core, and the rotor core is connected with the rotating shaft through a plurality of supporting ribs arranged at intervals;
a ventilation groove is arranged between the magnetic poles and comprises groove edges which are symmetrically arranged and groove bottom corners with circular arcs, and the positions of the groove bottom corners are close to the rotating shaft;
the rotor core comprises a plurality of lamination sheets, a plurality of groups of permanent magnets are arranged on the outer side of each lamination sheet, the permanent magnets are uniformly distributed on the magnetic poles, each group of permanent magnets comprises two permanent magnets which are symmetrically arranged, and an included angle between the two permanent magnets is 110 degrees.
As a further improvement, the rotor core is provided with holes at the positions of the fixed magnetic poles, and fastening bolts are arranged in the holes and used for fixing the relative positions of the punching sheets.
As a further improvement of the present invention, the position of the hole is set in a sector area formed by two permanent magnets in each group of permanent magnets.
As a further improvement, the position towards fixed permanent magnet on the piece is provided with the permanent magnet groove, forms between two adjacent permanent magnet grooves and separates the magnetic bridge.
As a further improvement of the present invention, the permanent magnet slot includes two symmetrical sides, and a magnetism isolating slot is formed between the two sides and the permanent magnet, wherein one side is parallel to the slot side of the ventilation slot adjacent thereto, and the other side is parallel to the side of the other permanent magnet slot adjacent thereto.
As a further improvement of the utility model, be provided with permanent magnet location slot on the permanent magnet groove.
As a further improvement of the utility model, the width dimension of the magnetic isolation bridge is the same.
As a further improvement of the utility model, the fastening bolt with set up insulating cover between the punching sheet.
As a further improvement, the circle centers corresponding to the arc edges on each magnetic pole are not overlapped.
The beneficial effects of the utility model reside in that:
under the condition of ensuring the stable structure of the rotor, the torque fluctuation of the motor is effectively reduced, the heat dissipation performance of the motor is improved, the strength of the iron core is enhanced, and the reliable operation of the motor is ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is a schematic view of the axial section of the present invention.
Description of reference numerals: 1. supporting ribs; 2. a rotating shaft; 3. a rotor core; 4. a magnetic pole; 5. an aperture; 6. a magnetism isolating groove; 7. a magnetic isolation bridge; 8. a permanent magnet slot; 9. a permanent magnet; 10. a permanent magnet positioning groove; 11. a ventilation trench; 12. fastening a bolt; 13. pressing a ring by a rotor; 31. punching; 81. a side edge; 111. a groove edge; 112. the bottom corner of the groove.
Detailed Description
The invention will be further described with reference to the following examples in the drawings:
as shown in the figure, the magnetic pole structure of a high-power motor mainly aims at 16-pole and above motors, and comprises a rotating shaft 2 and a rotor core 3 arranged around the rotating shaft 2, wherein a rotor pressing ring 13 is arranged on the periphery of the rotor, a plurality of magnetic poles 4 are uniformly arranged on the outer ring of the rotor core 3, the polarities of the adjacent magnetic poles 4 are opposite, and the rotor core 3 is connected with the rotating shaft 2 through a plurality of supporting ribs 1 arranged at intervals; a ventilation groove 11 is arranged between the magnetic poles 4, the ventilation groove 11 comprises symmetrically arranged groove edges 111 and groove bottom corners 112 with circular arcs, and the positions of the groove bottom corners 112 are close to the rotating shaft 2; rotor core 3 includes a plurality of laminating towards piece 31 that sets up, be provided with multiunit permanent magnet 9 on the outside towards piece 31, 9 equipartitions of permanent magnet set up on the magnetic pole 4, every group permanent magnet 9 is including two of symmetry setting, the contained angle between two permanent magnets 9 is 110.
A hole 5 is formed in the position of the fixed magnetic pole 4 on the rotor core 3, and a fastening bolt 12 is arranged in the hole 5 and used for fixing the relative positions of the plurality of punching sheets 31; the position of the hole 5 is arranged in a sector area formed by two permanent magnets 9 in each group of permanent magnets 9; an insulating sleeve is arranged between the fastening bolt and the punching sheet 31.
The circle centers corresponding to the arc edges on each magnetic pole 4 are not overlapped, namely the radius of the pole arc corresponding to each magnetic pole 4 is made to be smaller than the radius of the inner circle of the stator and extends to the structure, and the arc edges are connected together to form a complete circle. The pole arc coefficient of the rotor core 3 is about 0.7, the air gap at the center of the pole arc is minimum, the air gaps are gradually increased along the directions of two sides of the center line of the pole arc, and meanwhile, the surface area of the rotor core 3 is also increased.
The utility model discloses a theory of operation does:
the arrangement of the supporting ribs simplifies the structure of the rotor core, leaves more ventilation positions and is beneficial to heat dissipation; due to the arrangement of the ventilation grooves, the heat dissipation area is increased in the area with higher temperature of the rotor core, and the heat dissipation efficiency of the motor is guaranteed.
The setting of fastening bolt can guarantee under the more condition of magnetic pole, under the great condition of motor power promptly, and the operation is stable between the piece of punching of being pressfitting, can not appear because of the condition of centrifugal force two offset.
The magnetic poles are arranged in an offset mode, each group of permanent magnets are arranged in an offset mode, and the magnetic isolation bridges and the magnetic isolation grooves are arranged in a structure mode, so that the magnetic pole offset mode is simple, the built-in permanent magnet synchronous motor rotor is convenient to transform and easy to operate. The cooling effect is better, and structural strength is higher.
Claims (9)
1. A magnetic pole structure of a high-power motor comprises a rotating shaft (2) and a rotor core (3) arranged around the rotating shaft (2), wherein a plurality of magnetic poles (4) are uniformly arranged on the outer ring of the rotor core (3),
the rotor core (3) is connected with the rotating shaft (2) through a plurality of supporting ribs (1) arranged at intervals;
ventilation grooves (11) are formed between the magnetic poles (4), each ventilation groove (11) comprises symmetrically arranged groove edges (111) and a groove bottom angle (112) with an arc, and the position of each groove bottom angle (112) is close to the rotating shaft (2);
rotor core (3) include towards piece (31) that a plurality of laminating set up, be provided with multiunit permanent magnet (9) on the outside towards piece (31), permanent magnet (9) equipartition sets up on magnetic pole (4), every group permanent magnet (9) is including two that the symmetry set up, the contained angle between two permanent magnets (9) is 110.
2. The magnetic pole structure of a high power motor according to claim 1, wherein the rotor core (3) is provided with a hole (5) at the position of the fixed magnetic pole (4), and a fastening bolt (12) is arranged in the hole (5) and used for fixing the relative position of the plurality of punching sheets (31).
3. A pole structure of a high power electric machine according to claim 2, characterized in that the position of the holes (5) is arranged in the sector area of two permanent magnets (9) in each set of permanent magnets (9).
4. The magnetic pole structure of a high-power motor according to claim 1, wherein permanent magnet slots (8) are formed in the position where the permanent magnets (9) are fixed on the punching sheet (31), and a magnetic isolation bridge (7) is formed between two adjacent permanent magnet slots (8).
5. A pole structure of a high power motor according to claim 4, characterized in that the permanent magnet slot (8) comprises two symmetrical sides (81), and a magnetic isolation slot (6) is formed between the two sides (81) and the permanent magnet (9), wherein one side (81) is parallel to the slot side (111) of the ventilation slot (11) adjacent to the one side, and the other side (81) is parallel to the side (81) of the other permanent magnet slot (8) adjacent to the other side.
6. A pole structure of a high power electric machine according to claim 4, characterized in that the permanent magnet slots (8) are provided with permanent magnet positioning grooves (10).
7. A pole structure of a high power electric machine according to claim 4, characterized in that the width dimensions of the magnetic bridges (7) are all the same.
8. The pole structure of a high power electrical machine according to claim 2, characterized in that an insulating sleeve is arranged between the fastening bolt and the punching sheet (31).
9. The pole structure of a high power electric machine according to claim 1, characterized in that the corresponding centers of the circular arc edges on each pole (4) do not coincide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223234414.XU CN218771472U (en) | 2022-12-02 | 2022-12-02 | Magnetic pole structure of high-power motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223234414.XU CN218771472U (en) | 2022-12-02 | 2022-12-02 | Magnetic pole structure of high-power motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218771472U true CN218771472U (en) | 2023-03-28 |
Family
ID=85679830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223234414.XU Active CN218771472U (en) | 2022-12-02 | 2022-12-02 | Magnetic pole structure of high-power motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218771472U (en) |
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2022
- 2022-12-02 CN CN202223234414.XU patent/CN218771472U/en active Active
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